#include <iostream>
#include <algorithm>
using namespace std;

signed main()
{
    int n;
    cin>>n;
    int a[10005];
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    sort(a,a+n);
    int sum = a[0];
    for(int i=1;i<n;i++){
        sum = (sum+a[i])/2;
    }
    cout<<sum<<"\n";
    return 0;
}
